HP Deskjet 3520 blocked nozzles?

Have had my HP Deskjet 3520 since Dec 2012 but of late the yellow and black printheads have given up on me.Blue and Cyan are fine. I did the printer status report and nozzle check, cleaned the printheads but no dice.

The yellow cartridge is low but there's been no warning to change it and there's enough of the other 3. My OS is Windows 8 :-/

Finally, clean the printhead one more time. If the nozzles are badly clogged, then you may need multiple printhead cleanings to recover the printhead.

If these steps do not resolve the issue, then the printer might need service. If the printer is under warranty, please contact HP support for assistance.

Say thanks by clicking the Thumbs up icon in the postPlease mark reply as "Accept as Solution" if it solved the problem, so others can find it.Although I am an HP employee, I am speaking for myself and not for HP